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9VAC25-32-460. Soils monitoring.

A. Soil shall be sampled and analyzed prior to biosolids application. No sample analysis used to determine application rates shall be more than three years old at the time of biosolids land application. Soil shall be sampled and analyzed in accordance with Table 1 of this section. Reduced monitoring may also apply to one time biosolids applications to forest or reclaimed lands. For background analysis, random composite soil samples from the zone of incorporation is required for infrequent applications and frequent applications at less than agronomic rates (total less than 15 dry tons per acre).






Soil pH (Std. Units)


Available phosphorus (ppm)2


Extractable potassium (ppm)


Extractable sodium (mg/100g)3


Extractable calcium (mg/100g)


Extractable magnesium (mg/100g)


Zinc (ppm)


Manganese (ppm)


1Note: Unless otherwise stated, analyses shall be reported on a dry weight basis.

2Available P shall be analyzed using one of the following methods: Mehlich I or Mehlich III.

3Extractable sodium shall be analyzed only where biosolids known to be high in sodium will be land applied.

B. The permit applicant or permit holder may be required to conduct soil testing and analysis of additional parameters, as determined by the department, based on site-specific history or conditions.

C. Samples shall be collected in accordance with  10.1-104.2 of the Code of Virginia.

Statutory Authority

62.1-44.15 of the Code of Virginia.

Historical Notes

Derived from Virginia Register Volume 24, Issue 6, eff. January 1, 2008; amended, Virginia Register Volume 29, Issue 24, September 1, 2013.

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